April Fools Day is celebrated each year on April 1, as it has been for centuries.
The day sees people play pranks and jokes on each other, with some people going to greater lengths to do so than others. Many brands and TV programmes also get in on the joke, with fake news segments and "new additions" that are entirely made up.
But where does April Fools Day originate from? And why does it fall on April 1?
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Some historians think April Fools dates as far back as 1582. This is when France switched from the Julian calendar to the Gregorian calendar, as called for by the Council of Trent in 1563.
In the Julian Calendar, as in the Hindu calendar, the new year began with the spring equinox around April 1, according to History.com.
While some people were slow to get the news, or failed to recognise the beginning of the year had moved, they continues to celebrate it around April 1. These people became the butt of jokes and tricks - "April fools".
One prank included putting a paper fish on the backs of these people, said to symbolise a gullible person.
April Fools Day is thought to have spread across the UK later, during the 18th Century.
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